You might recall I had been trying to figure out a way to hold the Rolling Steel Tent's rear door partly open in a way that the wind couldn't blow it open or closed. You might also recall that Forrest came up with a very simple solution. A block, a bungee cord, presto.
I was happy with that solution until I saw what Swankie uses. It's called the Ventlock.
here's a link to it.
The hook screws out of the heavy steel rod. You slip the hook over the loop or post part of your door/hatch lock system (see samples below) and spin the rod to tighten.
Unfortunately, they're not cheap. But someone with some basic welding skills could make one. Or if you don't need or can't use the security aspect, then a clip at one end of a stick and a loop on the other will work just as well. I think I need to make a trip to the hardware store.